Navigation Links
Underwater, Humans Hear Through Their Bones
Date:5/24/2011

By Jenifer Goodwin
HealthDay Reporter

TUESDAY, May 24 (HealthDay News) -- Humans possess the ability to hear far higher pitched sounds when underwater than they can while on terra firma.

How can they do it? By "hearing" with their bones rather than through the normal pathways of hearing, U.S. Navy researchers report.

The way in which humans hear above or below water differs; that difference means they only hear between 20 and 20,000 hertz through the air, while they can catch sounds all the way up to 200,000 hertz when submerged.

On land, humans hear through air conduction. Sound pressure waves cause tiny disturbances in the air that travel into the ear canal and vibrate the ear drum, which is connected to the three smallest bones in the body, the ossicles of the middle ear.

The ossicles are connected to the cochlea, which is filled with fluid and contains "hair cells," or tiny protrusions that also move, stimulating the auditory nerve, which sends signals to the brain.

"Human hearing is magnificent," said Bill Martin, a hearing scientist at the Oregon Hearing Research Center in Portland. "The ear drum only has to move less than the diameter of a hydrogen atom for us to perceive sound."

The cochlea, too, is complex. Similar to a rolled up piano keyboard, portions of the cochlea are responsible for hearing specific frequencies that help humans differentiate between, say, a bird tweeting and a garbage truck.

But underwater, humans don't hear using the normal channels. Instead, the study found that humans hear through bone conduction, which bypasses the outer ear and the ossicles of the middle ear.

Instead, sound comes through the mastoid, or the bone you can feel if you put your fingers behind the ear.

"By using bone conduction, the human ear can actually receive sounds at frequencies way higher than most people would have expected," Martin explained.

While expert
'/>"/>

Copyright©2010 ScoutNews,LLC.
All rights reserved  

Page: 1 2 3

Related medicine news :

1. New drug for kidney transplant recipients effective in humans
2. Dolphins May Warn of Health Risks in Humans
3. Humans Tree-Dwelling Ancestors May Have Also Walked Upright
4. Tiny Fish Might Help Humans Fix Damaged Hearts
5. McGill-UBC project creates mouse grimace scale to help identify pain in humans and animals
6. Caring for Diabetic Pets Helps Humans Get Healthier
7. Hallmark Alzheimers disease changes found in retinas of humans and imaged in live animals
8. Cancer-metabolism link runs deep in humans
9. Plant compound resveratrol shown to suppresses inflammation, free radicals in humans
10. Scientists develop the first model for investigating the origins of testicular cancer in humans
11. Scientists find link in humans between nerve cell production, memory
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Underwater, Humans Hear Through Their Bones 
(Date:7/14/2014)... News) -- Being physically active in middle age appears ... other types of dementia, suggest the findings from two ... physical exercise at various levels, especially in midlife, is ... Mayo Clinic, said in an Alzheimer,s Association news release. ... yet conclusive. More research is needed to determine the ...
(Date:7/14/2014)... Skin M.D. by ... on Monday, July 14th, located at 45 East ... last all week through Saturday, July 19th, with ... welcomed to attend. The business is owned by ... anti-aging, weight loss services, and sells high-end industry ...
(Date:7/14/2014)... The NIH is giving $8 million ... fund a clinical trial on light-based therapy in mesothelioma ... newly-posted article on the research. , Scientists at ... to enroll 102 pleural mesothelioma study participants ... photosensitizing drug prior to surgery. Then half will have ...
(Date:7/14/2014)... “You've probably heard the expression, 'You ... mean?” This question was posed in an article by ... Medical Group’s blog regarding how people should select what ... . , According to the article, individuals who consume ... a high risk of dehydration and consequent negative health ...
(Date:7/14/2014)... Cabin Chiang Mai, Asia’s leading inpatient addiction treatment centre, ... – a free comprehensive aftercare service for clients who ... they live in the world. , The Cabin firmly ... maintain their recovery after successfully completing primary treatment should ... As a chronic disease, addicts in recovery are always ...
Breaking Medicine News(10 mins):Health News:Staying Active May Help Prevent Dementia 2Health News:The Cosmetic Medic Announces Grand Opening of New Skin M.D., a Physician-Administered Anti-aging, Skincare, and Weight Loss Practice 2Health News:The Cosmetic Medic Announces Grand Opening of New Skin M.D., a Physician-Administered Anti-aging, Skincare, and Weight Loss Practice 3Health News:New Research Could Expand Availability of Light-Based Mesothelioma Therapy, According to Surviving Mesothelioma 2Health News:Drink With Your Mental Health in Mind, Advises an Article by Mental Health America Featured by Western Washington Medical Group 2Health News:The Cabin Chiang Mai Addiction Rehab Launches Industry-leading Aftercare Service 2Health News:The Cabin Chiang Mai Addiction Rehab Launches Industry-leading Aftercare Service 3
... to prevent heart failure, stroke , WEDNESDAY, Nov. ... status as the best first-line treatment in older ... research concludes. , The thiazide-type diuretic chlorthalidone outshone ... an ACE inhibitor and an alpha-receptor blocker -- ...
... to Release Statewide Data , HARRISBURG, Pa., Nov. 18 Pennsylvania ... children and adults living with autism, according to the Pennsylvania Autism ... , "With the release of this report, Pennsylvania becomes the ... prepare to meet the needs of the rapidly growing population of ...
... , CLEVELAND, Nov. 18 Hospice workers have seen patients ... them. Researchers from the Frances Payne Bolton School of Nursing ... Reserve University will study what drives the dying to resolve ... Mary Jo Prince-Paul from nursing and Julie Exline from arts ...
... captures insects, an innovative new device with nano-sized features developed ... in the blood that have broken off from a tumor. ... tumor cells, or CTCs, can provide critical information for examining ... effectiveness of therapies. Metastasis ...
... common surgical painkillers help cancer cells thrive , WEDNESDAY, ... to growing evidence that morphine and other opiate-based painkillers ... , The papers, scheduled to be presented Wednesday at ... preventing opiates from reaching lung cancer cells reduces cancer ...
... ... Organization is asking for nominations for the 2010 Innovations in Healthcare(SM) ABBY ... Event, on April 28, 2010, in Newport Beach, California. At this event, ... of the toughest problems facing healthcare today, and three will take home ...
Cached Medicine News:Health News:Diuretics Still Best Treatment for High Blood Pressure 2Health News:PA Governor Rendell: New Report Shows Demand for Autism Services will Continue to Rise 2Health News:Research Collaboration Focuses on Unfinished Business at the End of Life 2Health News:UCLA researchers create 'fly paper' to capture circulating cancer cells 2Health News:UCLA researchers create 'fly paper' to capture circulating cancer cells 3Health News:Morphine May Help Tumors Spread in Cancer Patients 2Health News:Nominate Your Favorite Innovative Healthcare Company for the 2010 ABBY Awards 2Health News:Nominate Your Favorite Innovative Healthcare Company for the 2010 ABBY Awards 3Health News:Nominate Your Favorite Innovative Healthcare Company for the 2010 ABBY Awards 4
(Date:7/11/2014)... 2014 Research and Markets has ... Medical X-ray Film Industry Report 2014" report to ... Global And Chinese Medical X-Ray Film Industry ... the current state of the Global medical X-ray film ... The report provides a basic overview of the industry ...
(Date:7/11/2014)... 2014 On Thursday, July ... the Dow Jones Industrial Average finished the day 0.42% lower ... 0.41%. The losses were broad based as eight out of ... Health Care Sector Index ended the day at 711.88, down ... one month. Investor-Edge has initiated coverage on the following equities: ...
(Date:7/11/2014)... , July 11, 2014 Neurelis, Inc. ... ("Biotie") to end the option held by Biotie to ... further development of NRL-1 (intranasal diazepam) for pediatric and ... Over the past year, Biotie has advanced the ... preparation for the pivotal clinical work required for NDA ...
Breaking Medicine Technology:Global and Chinese Medical X-ray Film Industry Report 2014 2Health Care Equipment Equities Movers and Shakers -- Research on Covidien, Baxter, DexCom, and Boston Scientific 2Health Care Equipment Equities Movers and Shakers -- Research on Covidien, Baxter, DexCom, and Boston Scientific 3Health Care Equipment Equities Movers and Shakers -- Research on Covidien, Baxter, DexCom, and Boston Scientific 4Neurelis Regains Rights to Intranasal Diazepam Program 2Neurelis Regains Rights to Intranasal Diazepam Program 3
... BEIJING, June 22, 2011 /PRNewswire-Asia-FirstCall/ -- China Medical ... ), a leading China-based advanced in-vitro diagnostic ("IVD") ... GP Medical Technologies Co., Ltd. ("GP Medical"), has ... An Healthcare Investment Ltd. ("Da An Health") to ...
... Millstone Medical Outsourcing announced today that the ... online inventory management system.  After several months of ... password-protected system used by medical device manufacturers to ... of the enhanced inventory management system include increased ...
Cached Medicine Technology:China Medical Technologies Announces Strategic Collaboration Between its Subsidiary, GP Medical, and Da An Health 2China Medical Technologies Announces Strategic Collaboration Between its Subsidiary, GP Medical, and Da An Health 3Millstone Medical Outsourcing Introduces Advanced Version of Online Inventory Management System 2
... ARUP Laboratories is a national reference ... laboratory research and development. ARUP offers an ... unique medical tests in clinical and anatomic ... ARUP Laboratories' clients include more than half ...
... reference laboratory and a worldwide leader in ... an extensive test menu of highly complex ... anatomic pathology. Owned by the University of ... half of the nation's university teaching hospitals ...
... ARUP Laboratories is a national reference ... laboratory research and development. ARUP offers an ... unique medical tests in clinical and anatomic ... ARUP Laboratories' clients include more than half ...
... a national reference laboratory and a worldwide ... ARUP offers an extensive test menu of ... clinical and anatomic pathology. Owned by the ... more than half of the nation's university ...
Medicine Products: